EP3194831B1 - Kapazitiver sensor - Google Patents

Kapazitiver sensor Download PDF

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Publication number
EP3194831B1
EP3194831B1 EP15738055.1A EP15738055A EP3194831B1 EP 3194831 B1 EP3194831 B1 EP 3194831B1 EP 15738055 A EP15738055 A EP 15738055A EP 3194831 B1 EP3194831 B1 EP 3194831B1
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EP
European Patent Office
Prior art keywords
capacitive sensor
electrically conductive
circuit carrier
rigid
carrier
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP15738055.1A
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German (de)
English (en)
French (fr)
Other versions
EP3194831A1 (de
Inventor
Volker Hartmann
Volker Eisenhardt
Norbert Wenzel
Dietrich Schupp
Frank Gaesslein
Joachim Frangen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
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Publication of EP3194831A1 publication Critical patent/EP3194831A1/de
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/955—Proximity switches using a capacitive detector
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
    • F16P3/12—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine
    • F16P3/14—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact
    • F16P3/148—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact using capacitive technology
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • G01V3/088—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices operating with electric fields

Definitions

  • the invention relates to a capacitive sensor for area detection of the approach of an object.
  • the capacitive sensor element consists of a layered structure of flexible, electrically conductive and electrically insulating layers. Several lined-up capacitive sensor elements form a sensor skin that can be pulled like a jacket over a machine part to be protected.
  • the pamphlet U.S. 2006 097734 A1 describes a proximity sensor using a capacitance sensor.
  • the proximity sensor includes a detection antenna with multiple capacitance sensors each including a sensing electrode.
  • an apparatus for detecting an approach is disclosed, the apparatus having a keyboard function.
  • This device includes a substrate, a detection circuit, a key unit and a main control unit.
  • the device is designed to detect an approach by means of the detection circuit and the main control unit, with a detected approach being understood as a keystroke if the detected position corresponds to a key.
  • a sensor system for monitoring the surroundings of a mechanical component is known.
  • This system has at least one capacitive sensor.
  • the U.S. 2010 026 656 describes a capacitive sensor behind a mask.
  • the capacitive sensor according to the invention with the features of the independent claim is characterized by a stable structure.
  • This has the advantage that as a result, large and rigid capacitive sensors can be produced which can be mounted quickly and safely on the machine parts, in particular on a mechatronic system or a handling device, in particular on a linear axis, on a robot, on a transport system or on a gripper of a robot.
  • the capacitive sensor according to the invention has the advantage that built-in capacitive sensors can be easily replaced. In addition, simple module tests are possible in the dismantled state.
  • Stiffness is a quantity that indicates the resistance a body can offer to deformation caused by external influences.
  • the flexural rigidity is defined as the product of the area moment of inertia I F and the modulus of elasticity E.
  • the flexural rigidity thus depends both on the cross-sectional shape (shaping of the component) and on the material itself (modulus of elasticity).
  • the torsional stiffness is defined as the product of the torsional moment of inertia I T and the material shear modulus G. The torsional rigidity is therefore also dependent on the component and material.
  • the rigidity is defined using the mean modulus of elasticity and the thickness.
  • polyethylene with a modulus of elasticity of 200 MPa already has flexural strength or torsional rigidity
  • polycarbonate with a modulus of elasticity of 2400 MPa is also rigid and/or torsionally rigid.
  • Steel with a modulus of elasticity of 210000 Mpa is also rigid and/or torsionally rigid with a thickness of 2 mm.
  • the capacitive sensor is rigid and/or torsionally rigid if the product of the thickness and the modulus of elasticity of at least one element or a combination of at least two individual elements, in particular the circuit carrier and/or the spacer element and/or the carrier and/or the encapsulated capacitive sensor, is greater than 200 MPa mm, preferably greater than 1800 MPa mm, in particular greater than 4000 MPa mm.
  • the capacitive sensor has at least two mutually adjacent electrically conductive surfaces which are insulated from one another and form an electrical capacitance such that the value of the capacitance changes when an object approaches.
  • an electric field is formed in the form of electric Field lines between the electrically conductive surfaces in the space between the electrically conductive surfaces.
  • this electric field is disturbed, which means that the spatial distribution of the electric field lines changes, so that the result is a measurable change in the capacitance value when an object approaches.
  • the circuit carrier, in particular the printed circuit board, of the capacitive sensor is already designed to be rigid and/or torsionally rigid on its own, so that the entire capacitive sensor is rigid and/or torsionally rigid.
  • the rigid and/or torsionally rigid design of the circuit carrier has the advantage that this contributes to a cost-effective capacitive sensor, since the circuit carrier is a mass-produced product and therefore a cost-effective component.
  • the spacer element of the capacitive sensor is already designed to be rigid and/or torsionally rigid on its own, so that the entire capacitive sensor is rigid and/or torsionally rigid.
  • the flexurally and/or torsionally rigid design of the spacer element between the circuit carrier and the electrically conductive surfaces of the capacitors has the advantage that the flexural and/or torsional rigidity can be produced cost-effectively as a result. This is due to the fact that the other requirements for the spacer element are low and therefore an inexpensive material can be used.
  • the use of a thermoplastic material or a duroplastic material is particularly advantageous.
  • the spacer element preferably has a dielectric constant of less than 1.5, preferably less than 1.1, in particular less than 1.01.
  • the spacer element preferably consists of foamed plastic and/or of webs and/or of foam rubber.
  • non-rigid and / or torsion board with a likewise non-rigid and / or torsion-resistant spacer element, such as a foam rubber, with the connection of this non-rigid and / or torsion board with the not rigid and/or torsionally rigid spacer element, for example by gluing, the composite consisting of circuit board and spacer element is rigid and/or torsionally rigid.
  • a non-rigid and / or torsion board with a likewise non-rigid and / or torsion-resistant spacer element such as a foam rubber
  • the electrically conductive surfaces are in contact with the circuit carrier via electrically conductive connections through the spacer element, since this contributes to a compact structure, since no separate electrical connections are necessary.
  • the carrier of the capacitive sensor is already designed to be rigid and/or torsionally rigid on its own, so that the entire capacitive sensor is rigid and/or torsionally rigid. Since established production processes can be used to produce the carrier, this contributes to the capacitive sensor being able to be produced cost-effectively.
  • the capacitive sensor is designed to be rigid and/or torsionally rigid by casting the capacitive sensor and/or by foaming the capacitive sensor.
  • the potting or foaming also contributes to the fact that the capacitive sensor is particularly robust against environmental influences such as moisture.
  • At least two of the electrically conductive surfaces are inclined relative to one another at an angle of between 0° and 135°, preferably at an angle of between 45° and 90°. This helps ensure that corners of machine parts can also be monitored.
  • the capacitive sensor has four electrically conductive surfaces which are connected in such a way that the electrically conductive surfaces form at least two electrical capacitances, the electrically conductive surfaces being arranged in such a way that detection areas of the two electrical capacitances formed by electrical field lines overlap at least partially .
  • the capacitive sensor according to the invention is used in robots, in particular in industrial robots, since this enables a user-safe cooperation between people and moving machine parts of the robot in the same working area at the same time. This is made possible by the capacitive sensor on the one hand essentially covering the entire surface of the moving machine parts of the robot and on the other hand the approach of an object being recognized very early on without the need for physical contact.
  • the capacitive sensor comprises a circuit carrier and a spacer element and preferably a carrier.
  • the circuit carrier is designed to be rigid and/or torsionally rigid and the spacer element is preferably designed to be rigid and/or torsionally rigid and/or the carrier is designed to be rigid and/or torsionally rigid.
  • the circuit carrier is preferably in the form of a circuit board and is used for making electrical contact with the electrically conductive surfaces of the capacitive sensor.
  • the spacer element is arranged between the electrically conductive surfaces and the circuit carrier.
  • the carrier is designed to connect the capacitive sensor to a machine part, in particular a machine part of an industrial robot.
  • FIG 1 shows the structure of a sensor element 10 of a capacitive sensor in a first embodiment.
  • the sensor element 10 consists of a layer structure, comprising a circuit carrier 14.
  • the circuit carrier 14 is designed as a rigid and torsionally rigid circuit board.
  • the circuit carrier 14 is designed to be flexible as a film.
  • the thickness of the circuit carrier is between 30 ⁇ m as a film and one to several millimeters, preferably 2 mm, as a rigid and torsionally rigid circuit board.
  • the rigid and torsionally rigid circuit board preferably has a thickness of 500 ⁇ m.
  • conductive traces 22 are fixedly arranged on the underside of the circuit carrier 14, the conductive traces 22 connecting the electrically conductive surfaces 12 located on the upper side of the sensor element 10 with not shown electrical components of the evaluation unit 24 electrically connect.
  • An electrically conductive shielding electrode 20 is arranged on the upper side of the circuit carrier 14 . The shielding electrode 20 faces the electrically conductive surfaces 12 .
  • the shielding electrode 20 is used for electromagnetic shielding of the evaluation unit 24 arranged under the circuit carrier 14.
  • a spacer element 18 is arranged on top of the shielding electrode 20.
  • the spacer element 18 consists of non-conductive, sheet material (plate material) which has a low dielectric constant.
  • the spacer element 18 preferably consists of foamed organic material and/or foamed inorganic material.
  • the spacer element 18 is flexible.
  • the spacer element is designed to be rigid and/or torsionally rigid.
  • the spacer element 18 ensures the predetermined distance between the electrically conductive surfaces 12 and the shielding electrode 20 .
  • a further circuit carrier 16 is arranged on top of the spacer element 18 .
  • the further circuit carrier 16 is designed as a circuit board or as a film. Electrically conductive surfaces 12, which are marked as A1 and B1, are applied to the further circuit carrier 16.
  • the electrically conductive surfaces 12 consist of conductive material, in particular copper.
  • the electrically conductive surfaces 12 are designed as solid surfaces made of conductive material, in particular copper, without using the additional circuit carrier 16.
  • the electrically conductive surfaces 12 are applied directly to the upper side of the spacer element 18.
  • the two electrically conductive surfaces 12 labeled A1 and B1 form an electrical capacitance, with an electrical field being formed between the two electrically conductive surfaces 12 after the capacitance has been electrically charged.
  • the capacitance changes measurably so that the approach of an object is detected.
  • the sensor element 10 has two further electrically conductive surfaces 12, not shown, denoted by A2 and B2.
  • the four electrically conductive surfaces 12 are arranged in such a way that detection areas of the two electrical capacitances formed by electrical field lines overlap at least partially.
  • the sensor element 10 is thus constructed redundantly, with two channels.
  • FIG 2 shows the structure of a sensor element 10 of a capacitive sensor in a second embodiment.
  • the second exemplary embodiment also corresponds to the first exemplary embodiment in the variants presented for the first exemplary embodiment. Only the spacer element 18 is constructed differently.
  • the sensor element 10 of the second exemplary embodiment also consists of two electrically conductive surfaces 12, designated A1 and B1, which form an electrical capacitance.
  • the electrically conductive surfaces 12 are connected to the spacer element 18 either via a further circuit carrier 16 or directly.
  • the sensor element 10 comprises a circuit carrier 14 with conductor tracks 22, an evaluation unit 24 and a shielding electrode 20.
  • the spacer element 18 consists of a grid made of non-conductive material, so that the grid has no disruptive effect on the operating principle of the capacitive sensor .
  • the spacer element 18 is also flexible.
  • the spacer element is designed to be rigid and/or torsionally rigid.
  • the functioning of the sensor element 10 in the second exemplary embodiment corresponds to the functioning of the sensor element 10 in the first exemplary embodiment.
  • the sensor element 10 has two further electrically conductive surfaces 12, not shown, denoted by A2 and B2.
  • the four electrically conductive surfaces 12 are arranged in such a way that the detection areas of the two electrical capacitances formed by electric field lines overlap at least partially, with the electrically conductive surfaces 12 labeled A1 and B1 and A2 and B2 each having a capacitance and thus a form detection area.
  • the sensor element 10 of the second exemplary embodiment is therefore also constructed redundantly, with two channels, since the spatial areas covered by the capacitances overlap.
  • FIG 3 shows the structure of a sensor element 10 of a capacitive sensor in a third exemplary embodiment.
  • the third exemplary embodiment is based on the first exemplary embodiment or the second exemplary embodiment and corresponds to them except for the use of a potting material 26 .
  • the sensor layer structure in particular the electrically conductive surfaces 12 and/or the circuit carrier and/or the additional Circuit carrier and/or the spacer element and/or the shielding electrodes 20 and/or the conductor tracks on the circuit carrier are cast rigidly with a hardening casting material 26, so that the capacitive sensor is rigid and/or torsionally rigid due to the casting material 26.
  • a gel is used as an alternative to the potting material 26 .
  • a foam in particular a hardening foam
  • the sensor layer structure in particular the electrically conductive surfaces 12 and/or the circuit carrier and/or the further circuit carrier and/or the spacer element and/or the shielding electrodes 20 and/or the conductor tracks on the circuit carrier, is alternative or built into a housing in addition to the potting material 26 .
  • the sensor element 10 of the third exemplary embodiment also includes four electrically conductive surfaces 12 labeled A1, A2, B1 and B2, the electrically conductive surfaces 12 labeled A1 and B1 and A2 and B2 forming a capacitance and thus a detection area.
  • the shielding electrodes 20 are arranged below these electrically conductive surfaces 12 .
  • the casting material 26 preferably consists of foam rubber and/or foam and/or polyurethane (PU) and/or polyethylene (PE) and/or polypropylene (PP).
  • FIG 4 shows an overview drawing of a sensor element 10 to illustrate the electrical contact according to the first embodiment.
  • the electrically conductive surface 12 shown as an example, labeled A1 and used as an electrode, which forms a capacitance with another electrically conductive surface (not shown), is connected via a flexible electrical conductor 28 through a hole 30 in the spacer 18 and/or through a hole 30 in the circuit carrier 14 is connected to the conductor tracks 22 arranged below the circuit carrier 14 .
  • the electrically conductive surface 12 is thus electrically connected to the evaluation unit 24 .
  • the electrical connection between the electrically conductive surface 12 and the conductor tracks 22 is produced by rigid, electrically conductive elements, in particular by pins, and/or by conductive plastics, with the conductive plastics preferably being applied by jet processes.
  • figure 5 12 shows the structure of a sensor segment 32 of a capacitive sensor consisting of a plurality of sensor elements 10 which are electrically and/or mechanically connected to one another via electrical connections 34 to form a sensor segment 32.
  • the sensor segment 32 has at least one electrical plug connection 36, preferably two electrical plug connections 36, which makes it possible to connect the sensor segment 32 electrically and/or mechanically to other sensor segments 32.
  • FIG 6 shows a machine part 40 with a capacitive sensor in a first embodiment.
  • sensor segments 32 or sensor elements according to the previous exemplary embodiments are mechanically connected to a carrier 42 to form a capacitive sensor in such a way that sensor segments 32 or the sensor elements are on the outside of carrier 42 and machine part 40 completely enclose.
  • the sensor segments 32 or the sensor elements are mechanically firmly connected to the carrier, in particular by gluing and/or screws and/or clamps.
  • the individual supports 42 are connected to one another via connectors 44, in particular corner connectors.
  • the supports 42 preferably consist of a solid material, so that the supports 42 are designed to be rigid and/or torsionally rigid.
  • the carriers 42 are mechanically connected to the machine part 40 by positive and/or non-positive locking. Alternatively or additionally, the carriers are firmly connected to the machine part 40 by connection techniques, in particular by screws and/or clamps and/or gluing and/or welding.
  • the sensor segments 32 or the sensor elements are provided with a protective element 46 on the outside.
  • the protective element 46 consists of a material that is non-conductive and/or has a low dielectric constant and/or is thin and/or has a constant dielectric constant under changing environmental conditions, in particular temperature and humidity, and with aging of the material.
  • the protective element 46 is preferably made of foamed plastic, in particular polyurethane (PU) and/or polyethylene (PE) and/or polypropylene (PP), preferably with a thickness of 2 to 10 mm, preferably 4 mm.
  • FIG 7 shows a machine part 40 with a capacitive sensor in a second embodiment.
  • sensor segments 32 or sensor elements according to the previous exemplary embodiments are mechanically connected to a carrier 42 to form a capacitive sensor in such a way that sensor segments 32 or the sensor elements are on the inside with respect to carrier 42 and machine part 40 enclose.
  • the sensor segments 32 or the sensor elements are mechanically firmly connected to the carrier, in particular by gluing and/or screws and/or clamps.
  • the individual supports 42 are connected to one another via connectors 44, in particular corner connectors.
  • the carriers 42 are mechanically connected to the machine part 40 by positive and/or non-positive locking.
  • the carriers are firmly connected to the machine part 40 by connection techniques, in particular by screws and/or clamps and/or gluing and/or welding.
  • the carriers 42 are connected to the connectors 44, the connectors 44 being mechanically connected to the machine part 40 by positive and/or non-positive locking.
  • the carrier 42 consists of a material which is non-conductive and/or has a low dielectric constant and/or has a small thickness and/or a constant dielectric constant under changing environmental conditions, in particular temperature and humidity, and with aging of the material having.
  • the supports 42 preferably consist of a solid material, so that the supports 42 are designed to be rigid and/or torsionally rigid.
  • the supports 42 particularly preferably consist of polycarbonate or polypropylene, preferably with a thickness between 1 and 10 mm, preferably 2 mm, particularly preferably 3 mm.
  • carriers 42 and/or the sensor segments 32 and/or the sensor elements of the above exemplary embodiments are preferably flat.
  • carriers 42 and/or the sensor segments 32 and/or the sensor elements of the above exemplary embodiments form surfaces of any shape.
  • the flexural rigidity and/or torsional rigidity of the capacitive sensor is achieved by a rigid and/or torsionally rigid carrier and/or by a rigid and/or torsionally rigid circuit carrier and/or by a rigid and/or torsionally rigid spacer element and/or a combination of these elements.
  • FIG figure 8 shows a machine part 40 with a capacitive sensor in a third exemplary embodiment
  • the sensor segment 32 according to FIG figure 3 is formed, in particular cast with a casting material.
  • the sensor segments 32 or sensor elements are mechanically connected to the machine part 40 by positive and/or non-positive locking.
  • the sensor segments 32 or sensor elements are firmly connected to the machine part 40 by connection techniques, in particular by screws and/or clamps and/or gluing and/or welding.
  • the sensor segments 32 or the sensor elements are provided with a protective element 46 on the outside.
  • the protective element 46 consists of a material that is non-conductive and/or has a low dielectric constant and/or is thin and/or has a constant dielectric constant under changing environmental conditions, in particular temperature and humidity, and with aging of the material.
  • the electrically conductive surfaces designed as electrodes are preferably designed to be square. Alternatively or additionally, the electrically conductive surfaces are designed as triangles. In a further variant, the electrically conductive surfaces are round and/or in the form of polygons.
  • the sensor elements have 2 channels with at least three, preferably 4, electrically conductive surfaces that are arranged and connected in such a way that the electric field lines of the at least two capacitances formed by the connection of the electrically conductive surfaces cover a common spatial area.
  • FIG 9 shows a machine part 40 with a capacitive sensor in a fourth embodiment.
  • the electrically conductive surfaces 12 (electrodes) labeled A1, B1, A2 and B2 are not in one plane but two electrodes each on a first plane and the two further electrodes on a second plane which is inclined to the first plane , Preferably arranged at an angle ⁇ between 0° and 135°, in particular between 45° and 90°.
  • the electrodes A1/B1 and A2/B2 preferably form a capacitance, so that the spatial area of the edge 38 of the machine part 40 is monitored in two channels for an approach of an object.
  • the electrically conductive surfaces 12 are curved surfaces and/or the electrically conductive surfaces 12 are mounted on curved surfaces of the machine part 40 .
  • FIG 10 shows a sensor element 10 with an object 50.
  • the sensor element 10 has four electrically conductive surfaces 12 labeled A1, A2, B1 and B2.
  • the electrically conductive surfaces 12 labeled A1 and B1 form a first capacitance.
  • an electric field with field lines 48 forms between these electrically conductive surfaces 12 .
  • the electrically conductive surfaces 12 labeled A2 and B2 form a second capacitance.
  • an electric field with field lines 48 is also formed between these electrically conductive surfaces 12 .
  • the electric field of the two capacitances is formed alternately over time. In one variant, it is provided that the electric field of the two capacitances is formed at the same time.
  • the capacitance between the two electrically conductive surfaces 12 changes, so that the approach of the object 50 is detected. It is not necessary for the object 50 to touch the sensor element 10; instead, the change in capacitance as a function of the size of the electrically conductive surfaces 12 already occurs when the object 50 approaches the electrically conductive surfaces.
  • the detection range of the sensor is approximately as large as the distance between the two electrodes. The detection range is preferably between 1 mm and 300 mm.
  • the capacitive sensor in a robot uses the capacitive sensor in a robot to detect the approach of an object, in particular a human body part, based on the change in the value of the capacitance of a capacitor to be monitored, with the capacitor being connected by the two electrically conductive surfaces and the open field space is formed as a dielectric.
  • the capacitances to be monitored are measured and stored once as starting values C ij0 .
  • the capacitances C ij to be monitored are measured cyclically in a constant time frame, typically 100Hz - 1000Hz.
  • C ij applies to at least one capacitance C ij ⁇ C ij 0 / C ij 0 > T stat ; C ij : more current capacity etc ts reading ; C ij 0 : at initialization saved reading ; T stat : more applicable threshold , unit : % .
  • uniform data can be used for a large number of sensor elements, it also being possible for the limit values for individual sensor elements to be defined individually in special cases.
  • the dynamic approach detection results in a large switching distance at high speeds and a small switching distance at low speeds. This meets the physical law that longer braking distances are required at high speeds. The dynamic function thus promotes collision-free operation of the robot.
  • the static approach detection prevents body parts from being crushed even at low speeds, since the machine always stops safely if the minimum distance specified by T stat is not reached.
  • Circuit parts of the evaluation units of the sensor elements convert the measured values of the capacitances into electrical signals and transmit them to a central control unit, not shown in the figures.
  • the evaluation units preferably carry out a cyclical self-diagnosis to check all safety-relevant functions of the sensor element.
  • All evaluation units of the sensor elements are connected to the central control unit via electrical lines for energy and data transmission.
  • a plurality of sensor elements or sensor segments lined up in a row preferably form a flat capacitive sensor that covers the entire surface of the outer surface of a machine part, in particular a robot, particularly preferably a robot arm as a machine part, in such a way that the spatial environment of the machine part can be monitored for the approach of an object.
  • the described capacitive sensor or the sensor segments or the sensor elements can be used in different areas of application, for example in robots, in particular in industrial robots or service robots, as well as mobile platforms, vehicles, in particular unmanned vehicles, in medical technology and/or in the entertainment industry.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Remote Sensing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geophysics (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • Manipulator (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Electronic Switches (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
EP15738055.1A 2014-09-16 2015-07-13 Kapazitiver sensor Active EP3194831B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014218535.1A DE102014218535A1 (de) 2014-09-16 2014-09-16 Kapazitiver Sensor
PCT/EP2015/065927 WO2016041653A1 (de) 2014-09-16 2015-07-13 Kapazitiver sensor

Publications (2)

Publication Number Publication Date
EP3194831A1 EP3194831A1 (de) 2017-07-26
EP3194831B1 true EP3194831B1 (de) 2022-02-16

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US (1) US10666252B2 (da)
EP (1) EP3194831B1 (da)
JP (1) JP6419317B2 (da)
CN (1) CN106716838B (da)
DE (1) DE102014218535A1 (da)
DK (1) DK3194831T3 (da)
WO (1) WO2016041653A1 (da)

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DE102014218535A1 (de) * 2014-09-16 2016-03-17 Robert Bosch Gmbh Kapazitiver Sensor
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ITUA20163522A1 (it) * 2016-05-17 2017-11-17 Comau Spa "Copertura sensorizzata per un dispositivo industriale"
FR3070022B1 (fr) * 2017-08-10 2020-11-06 Fogale Nanotech Element d’habillage capacitif pour robot, robot muni d’un tel element d’habillage
JP7151072B2 (ja) * 2017-11-15 2022-10-12 セイコーエプソン株式会社 ロボット
FR3084002B1 (fr) * 2018-07-18 2020-07-10 Fogale Nanotech Appareil muni d'une detection capacitive et de ligne(s) electrique(s)
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CN106716838B (zh) 2020-10-23
JP2017531182A (ja) 2017-10-19
DE102014218535A1 (de) 2016-03-17
JP6419317B2 (ja) 2018-11-07
CN106716838A (zh) 2017-05-24
WO2016041653A1 (de) 2016-03-24
EP3194831A1 (de) 2017-07-26
DK3194831T3 (da) 2022-05-23
US20170257094A1 (en) 2017-09-07

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